Model-airplane



L. L. KAEss.

MODEL AIRPLANE.-

APPLICATION FILED MAR. 21, IQIS. 1,333,257. Patented Mm. 9,1920.

2 SHEETS-SHEET l. l' I. l

fluo/nua WM L. L. KAESS. MODEL AIRPLANE.

- APPLICATION FILED MAR. 21.1919. 1 ,338,257. v Patented Mur. 9, 1920.

2 SHEETS-SHUT 2.

` STATES PATENT onirica.

- LOULS L. KAESS, OF RICHMOND HILL, NEW YORK.

MODEL-Ammann.

Specification of Letters Patent. Y

Patented` Mar. 9, 1920.

Application filedv March 21, 1919. Serial No. 284,000. i

To all 'wh'omit may concern:

Be .it known that 5I, LOUIS L. KAEss, a citizen of the United States, residing at Richmond Hill, in the borough of Queens and Stateof New York, have invented a new and useful Improvement in Model -Airplanes, of which the following is a specifi-- cation. 'A i -Thisinvention relates to model airplanes, and my improvements are directed toward means 'for Simplifying their construction, as also for rendering them strong, easily assembled and disassembled.- and capable of adjustment for longitudinal and lateral balance.

Flying models contribute an important phase to the art .of aeronautics, because they are handled by youiig people who may thereby acquire their inceptionin aviation and .learn something about the sustentation of heavier-than-air machines; and it is my purpose to render available model airplanes which'aremore or less aerodynamically correct, to possess a measure of educational value, that their handling may prove instructive as well 'as entertaining.

Therefore my invention comprises the use ofwings built up of ribs and beams, with a@ 'suitable covering to provide pressure and upper surfaces having aerofoil contours; and means forsecuring said wings yto the airplane frame in adjustable manner, both as regards their longitudinal and lateral relation. A k Also, the frame structure, which lconsists of longerons that converge toward one end, has novell means for the detachable engage- 4ment of two prpellers at its other end; and

novel combined means for securing the vertica-l stabllizer and for providing 'engaging means whereby the elastic power bands,

which extend from the propellers, may be f suitably held. Q

- latter may be wound to generate .propulsive Still Afurther-myinvention includes the by two meshed pinions, which are revoluble oppositely through a hand-driven gear in mesh with one of said pinions, and the shafts of'said pinions engaging adjacent ends, re,

spectively,of said power bands, whereby the frce in the propellers'.

Other features and advantages' ofsn'iy Lsaid I invention will hereinafter appear,

In the drawings Figure 1" `is a plan view of my improved model airplane,

Fig. 2 is a'section on the line 2--2 ot' Fig. 1.

Fig. 3 is a detail of the duplex' winding -means for the power bands.

4 is a partial plan view of the frame, and

Fig. 5 is a side elevation of Fig. 4.

In the example of my invention illustrated in Fig. 1, -let 1-1 indicate the frame longerons, which are converged forwardly, and at theirv rearward, separated ends are connected by a' transverse member 2; an intermediate reinforce strut 3 also being proi vided.

spectively, comprise the main supportihg l surface and the tail surface. Said wings aresimilarly constructed, and, as shown 1n Fig.- 2, have the' ribs 6,.with beams 7 eX- tending transversely therethrough, a strip of cane 8 which extends` all around the wing edge, and asuitable covering 9.

Each wing is secured to the longerons by elastic bands, as 1`0, which, engaging each at two points beneath a longeron, and being drawnup-thereover, thus form a loop to receive the wing, and to tension'ally bind upon the vupper surface thereof. ,It will be seen thatthrough this simple means of connection between the wings and the frame, the positions' ofthe wings, both longitudinally, andwith 'regard to their lateralbalance, are adjustable with the greatest convenience. Also, as is evident, the wings are easily demounted by the mere removal of the elastic bands. y Brackets as 11, are secured to the .expandedends ofy the longerons, holes-,inv said -'brackets serving as bearings for the propeller shafts 12.'- These shafts are each comemployment of a winding device operable posed of a piece of wire that is secured to of the longerons, and boundby lashing 18,

fitting over the converged terminal ends.

. of said pinions The vertical stabilizer 19 is litted betvi'ren the longerons at this point and is thus also secured by the lashing.- According to usual practice the elastic bands are removed from the hooks 15 to twist them. l

Certain other features are shown in Figs. 3, 4 and 5. Thus, in Fig. 3, will be seen a novel means for .twisting oppositely the elastic bands to store energy for rotating the propellers. The band hooks 15 are here shown as disengaged from the eyelets 16, and caught in eyelets 20 which extend from the shafts of intermeshing pinions 21, 22: one meshing with a crown gear 23, pivoted to a bracket or support 24, that also carries said pinions. The bracket 24 is provided with a handle 25, and the gear 23 also has a handle 26 by which it may be rotated, to thus revolve pinions 21, 22 and twist the elastic bands. When twisted to a suitable tension the bands 14 are removed from eyelets 20 and returned to eyelets 16 to then impart rotation to the propellers.4

The support for hooks 15 may be in the forni of a triangular plate 27, which fits within 'a slot 28 in the converged Yends of the longerons (see Fig. 4), andis secured therein as by lashing, said plate having at its lateral corners, the. holes 29 to receive said hooks; and the vertical stabilizer 30,

l which -tsbetween said longerons, also havin a slot to receive said plate.

ittings for the transverse frame members, as 31, may consist of a piece of sheet metal `32, placed against the inner surface of a longeron, and secured thereto as by plns 33;

said piece 32 having lugs 34 which embrace the abutting end of a strut thereto as by pins 35.

Variations may be resorted to within the and are secured 'spirit and scope of my said invention and parts thereof'used without others.

I claim:

1. In a frame for model airplanes, in coml binatlon, converged longerons having a hori-4 zontal slot at their converged ends, and a plate fitted in said slot, said plate having laterally extended portions at opposite sides of the frame with means for engaging the propeller vdriving bands.

2. In a frame for model airplanes,n-con1v bination, converged longer-ons having a horizontal slot at their converged ends, a ver-v tical stabilizer litted between said longerons and having a slot alined lwith the slot in said longerons, and a plate ittedin said slots to unite said members, said plate having laterally extended portions at opposite sides of the frame with means for engaging the prof peller driving bands.

In testimony whereof, I have vsigned my name to this specification in the presence of two subscribing witnesses, this 10th day of February, 191

. LOUI'SL. KAESS. Witnessesz F. WfBARKER, RUTH NIoKoLA. 

